How to Track mobile website visitor by Google Analytics

I have created 2 website one for desktop www.xyz.com and 1 for mobile m.xyz.com

Desktop version I have already track by Google Analytics but now I want to traffic m.xyz.com

How can I track this, I want to show my mobile website traffic, landing pages, e-commerce conversation and all

I have read some article about mobile traffic, they write create segment and all but I cannot understood then, if any help me or proper guide step by step how to do that, then it will be great help for me

Then you can create a third combined view that will include traffic for both subdomains. If you want to see the domain name in the reports so you can differentiate the traffic you can add an advanced filter: